No, there wasn't. SLC production ended in 1981 and the 560 engine was introduced 5 years later in 1986. Your sheik probably had too much chic and tried a bit of badge engineering. There is a 560SL that was sold in the US, Japan and Australia.there was also a 560slc produced in small numbers for the US and the middle East unfortunately all, I think, with the ugly US federal bumpers . I remember seeing one hurtling down Park Lane in the 80s driven by a sheik with diplomatic plates.